Fix Sass deprecation warning (#28)
Fix Sass deprecation warning (#28)

Extending a compound selector, .btn-default.active, is deprecated and will not be supported in a future release.
Consider "@extend .btn-default, .active" instead.
See https://github.com/sass/sass/issues/1599 for details.
vinhnglx/active_bootstrap_skin,vinhnglx/active_bootstrap_skin,vinhnglx/active_bootstrap_skin